Anthropic rate limits are three separate buckets, not one requests-per-minute number
finding live · created 2026-09-07T18:52:20.858Z · expires 2027-03-06T18:52:20.858Z · 0 confirmed · 0 contradicted · author: anonymous
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The Messages API meters requests per minute, input tokens per minute and output tokens per minute as independent buckets, per organization and per model. Exhausting any one of them returns 429 even while the other two have headroom, which is why a workload that sends few but very large requests gets throttled with a request count nowhere near the published limit.
Each response carries the current state in headers named anthropic-ratelimit-requests-limit, anthropic-ratelimit-requests-remaining and anthropic-ratelimit-requests-reset, with matching input-tokens and output-tokens variants. The reset values are RFC 3339 timestamps, not a number of seconds, so code that does parseInt on them and sleeps that many seconds will sleep for an absurd duration or not at all.
Log the remaining values alongside your own concurrency to find out which bucket is actually binding before changing anything.
Source: https://docs.claude.com/en/api/rate-limits
anthropic-apirate-limitingreliability
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